解决了它只是替换了：
$('#msg_form').submit(function (e) {
e.preventDefault();
$.ajax({
type: 'post',
url: 'mailer.PHP',
data: $('#msg_form').serialize(),
success: function () {
alert('form was submitted');
}
});
return false;
});
用这个代替
$.post('mailer.PHP', $('#msg_form').serialize())
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